Performance, Brainstorming & TuningTalk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

Are there any nessesary supporting mods for rockers. I have a gutted air box, plugs, & 3.5". I know I should geta DHP to make use of the upper rpm power. However, anything I actually NEED like say, exaust work?